The Effect of 'R' Group in Bis (N-R, Salim) Nickel (II) on the Dehalogenation of Chloroform

C. T. NAHAR, A.J. MUKHBDKAR
1980 Zenodo  
Department of Chemistry, University of Poona, Pune-411 007, India Manuscript received 18 June 1979, accepted 26 July 1980 The study of the effect of 'R' group on the dehalogenation of chloroform prompted by the ligand substitution reaction system, consisting of bis (N-R, salim) nickel (II) (with R=H, CH3 C2H5, n-C3117, n-C4H2, s-C4H9,t-C4H9) and N,N,N',N'-tetramethyl­ethylenediamine has been carried out. The kinetics study has been followed by the mea­surement of rate of chloride release at
more » ... different temperatures. It has been observed that both, the basicity and geometrical characteristics of the R group control the kinetics of dehalogenation. A relationship between Taft substituent parameter of the R group and energy of activation has been observed. The deviation observed from this relation (R=H) has been attributed to the geometrical factors. The nature of the proposed inter­mediate has been substantiated by showing a correlation between the energy of activation and the downfield chemical shift of the methine proton. The data of activation entropy and enthalpy changes follow the isokinetic relationship, indicating the importance of the structural factors of the Schiff base complexes in the dehalogenation reaction
doi:10.5281/zenodo.6361808 fatcat:72ufzinnxjcydpcjogs6wswzay